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The technology varies, bus most pedometers use some type of "g" sensor to measure the number of steps or strides you take. You then multiply this by the length of your normal stride to get approximate distance.
I tried wearing my wife's pedometer for several games this season & averaged roughly 3500 strides per game. It takes me an average of 12 strides to make a lead/trail transition or vice versa, which on an average court is approx. 60 feet - translating into 5 feet per stride. Say I knock off 500 walking strides for misc. activities not in transition, this works out to approx. 15,000 feet, or just under 3 miles per game - 90% of which is done in sprints. Add to that the 500 strides at a normal gait of 2.5 feet and you get almost another 1/4 mile.
Not a bad workout for 75-90 minutes....now I know why those double-headers wear me out!
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